IS 12746-1-2: Telecontrol equipment and systems, Part 1: General considerations, Section 2: Guide for specifications

22 Pages·1993·1.6 MB·English

by  Bureau of Indian Standards

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IS 12746-1-2 (1993): Telecontrol equipment and systems,
Part 1: General considerations, Section 2: Guide for
specifications [LITD 10: Power System Control and
Associated Communications]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee””
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
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IS 12746 ( Part l/Set 2 ) : 1993
IEC Pub 870-l -2 ( 1989 )
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Indian Standard
TELECONTROLEQUIPMENTANDSYSTEMS
PART 1 GENERAL CONSIDERATIONS
Section 2 Guide for Specifications
UDC 621.398

@ BJS 1993
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
tsuguA 3991 Price Groap 7
Power eniL reirraC smetsyS dna detaicossA lortnoceleT tnempiuqE lanoitceS ,eettimmoC DTL 25
LANOITAN DROWEROF
sihT naidnI dradnatS hcihw si lacitnedi htiw CEI buP 2-l-078 (1989) lortnoceleT‘ tnempiuqe dna
smetsys - Part 1 : lareneG ,snoitaredisnoc noitceS 2 - ediuG for ,’snoitacificeps deussi yb the
lanoitanretnI lacinhcetortcelE noissimmoC ( CEI ) was adopted yb the uaeruB of naidnI sdradnatS
no the noitadnemmocer of the Power eniL reirraC smetsyS dna detaicossA lortnoceleT tnempiuqE
lanoitceS eettimmoC ( DTL 25 ) dna lavorppa of the scinortcelE dna noitacinummoceleT noisiviD
.licnuoC
ehT text of the CEI buP has neeb devorppa as elbatius for noitacilbup as naidnI dradnatS tuohtiw
.snoitaived niatreC snoitnevnoc are, ,revewoh ton lacitnedi ot those desu ni naidnI .sdradnatS
noitnettA si ylralucitrap nward ot the :gniwollof
a) reverehW the words lanoitanretnI‘ ’dradnatS appear gnirrefer ot siht ,dradnats yeht should
eb read as naidnI‘ .’dradnatS
)b ammoC ( , ) has neeb desu as a lamiced rekram elihw ni naidnI ,sdradnatS the tnerruc
ecitcarp si ot esu a tniop ( . ) as the lamiced .rekram
SSORC SECNEREFER
nI the adopted ,dradnats ecnerefer appears ot niatrec lanoitanretnI sdradnatS for hcihw naidnI
sdradnatS osla .tsixe ehT gnidnopserroc naidnI sdradnatS hcihw are ot eb detutitsbus ni rieht
ecalp are detsil woleb gnola htiw rieht degree of ecnelaviuqe for the snoitide :detacidni
International Standard Corresponding Indian Standard Degree of
Equivalence
CEI buP 495 ( 1974 ) dednemmoceR SI 9482 : 1980 citsiretcarahC seulav of yllacinhceT
seulav for citsiretcarahc tupni dna stupni dna stuptuo of elgnis dnabedis tnelaviuqe
tuptuo seititnauq of elgnis -edis CLP slanimret
dnab power enil reirrac smetsys
CEI buP l-l-078 ( 1988 ) lortnoceleT SI 12746 ( Part teS/l 1 ) : 1993 -eleT yllacinhceT
tnempiuqe dna smetsys - Part 1 : lortnoc tnempiuqe dna smetsys : tnelaviuqe
lareneG ,snoitaredisnoc noitceS Part 1 lareneG ,snoitaredisnoc
i - lareneG selpicnirp noitceS 1 lareneG selpicnirp

CEI buP l-2-078 ( 1987 ) lortnoceleT SI 12746 ( Part 2 ) : 1989 lortnoceleT yllacinhceT
tnempiuqe dna smetsys - Part 2 : tnempiuqe dna smetsvs : Part 2 tnelaviuqe
gnitarepO snoitidnoc - noitceS I latnemnorivnE snoitidnoc dna power
latnemnorivnE snoitidnoc dna seilppus
power seilppus
CEI buP 4-078 ( 1990 ) lortnoceleT SI 12746 ( Part 4 ) : 1993 lortnoceleT lacitnedI
tnempiuqe dna smetsys - Part 4 : tnempiuqe dna smetsys ; Part 4
ecnamrofreP stnemeriuqer ecnamrofreP stnemeriuqer
ehT denrecnoc lacinhcet eettimmoc elbisnopser for noitaraperp of siht dradnats has deweiver
the snoisivorp of the gniwollof lanoitanretni snoitacilbup dna has dediced that yeht are -pecca
elbat for esu ni noitcnujnoc htiw siht :dradnats
CEI buP 3-078 ( 1989 j lortnoceleT tnempiuqe dna smetsys - Part 3 : secafretnI ( lacirtcele
scitsiretcarahc )
CEI buP 5-078 lortnoceleT tnempiuqe dna smetsys - Part 5 : noissimsnarT slocotorp ( gnieb
deussi ni suoirav snoitces )
CEI buP 6-078 lortnoceleT tnempiuqe dna sinetsys - Part 6 : lortnoceleT slocotorp elbitapmoc
htiw 0SI dradnats dna TTICC snoitadnemmocer
ylnO the hsilgnE egaugnal text of the lanoitanretnI dradnatS has neeb deniater elihw gnitpoda ti
ni siht naidnT .dradnatS
IS 12746 (Part l/Set 2) : 1993
IEC Pub 670 -1-2 (1969)
Indian Standard
TELECONTROLEQUIPMENTA-NDSYSTEMS
PART I GENERAL CONSIDERATIONS
Section 2 Guide for Specifications
INTRODUCTION
Planning of telecontrol systems and defining the specifications of a
system and of its equipment are compiex and demand a large amount of
detailed information. There are not oniy application functions of the
system to be defined but also the operationai parameters, the local
environmental conditions and the data transmission parns avaiiable cts
well as their characteristics. The interfaces between the components of
the system and other equipment facilities such as power supply require
ments shall also be specified.
Many aspects of this field are covered by standards within the
IEC 870 series on telecontrol equipment and s, stems but many deci-
sions are still left to the engineers who have to pian a system and
establish the specifications.
1. Scope
This series of standards applies to teieconrroi equipment and systems
with coded bit serial data transmission for monitoring and control of
geographically widespread processes.

2. Object
This section presents guidelines but IIUI srandarcis for esraoiisiiirlg
specifications for telecontroi systems and equipment following the orner-
IEC standards on teiecontrol systerns and other r-eievdric international
standards and recommendations such as CCI TT recommendations. It
also facilitates the comparison of equipment of different manufacturers
The planning of telecontrol systems should be subdivided into clearly
defined steps:
The first step involves a consideration of the operational require
rnents of telecontrol systems (clause 3 of this set
In the second step, the conditions and IimItatIons of the data
transmission network are considered and the most suitabie utlli-
zation is specified (clause 4 of this sectIon)
IS 12746 (Part l/%X 2) : 1993
IEC Pub 670 -1-2 (1969)
Thirdly, the required facilities for the telecontrol equipment and
other equipment of telecontrol systems are specified. This includes
considerations of whether it is useful to include existing local
control equipment (clause 5 of this section).
The guidelines given in this section are applicable also if only parts
of telecontrol systems are needed. In this case only the relevant
clauses need be considered.
3. Description of the telecontrol system and its functions
Design aim of the system, for example:
“Main (or regional) control system. . . ” (name of the power company
or of the region), or
“District telecontrol system. . . ” (name of the district itself or of
the district control centre), or
“Telecontrol system for power station.. ’I. (name of the controlled
station).
3.1 Description of the telecontrolled (or telemonitored) process
3.1.1 Purpose of process to be controlled
(Short explanation only as far as necessary for planning telecontrol
systems. 1
3.1.2 Name of master stations and control centres
Description of the function, e.g. dispatching centre, regional control

centre, etc.

3.1.3 Number and names of outstations
Description of their functions, e.g. “Power station. . . ,I‘ “Transformer
station. . . “, etc.
3.1.4 Geographical configuration of the system
System block diagram and site description.
3.1.5 Location and distances between interconnected stations
3.2 Functions of telecontrol systems
3.2.1 Survey of application functions
3.2.1 1 Basic functions
Telemetering of the transfer power flow, generated power, sum-
mation of the power consumption, line voltage, frequency, tempera-
ture, water-levels, etc. ;
telecounting of the generated energy, energy consumption, energy
transfer, etc. ;
2
IS 12746 (Part l/Set 2) : 1993
IEC Pub 670 -1-2 (1989)
teleindication of the circuit-breaker, pro-tection functions, alarms,
etc;
telecommand of the circuit-breaker, etc. ;
time synchronization between outstations and master station;
time tagging of information.
3.2.1.2 Extended processing functions
Teleregulation of the generated power (manually or automatically
controlled);
automatic power/frequency regulation;
state estimation;
automatic load shedding;
switching programmes;
operator interface ( such as system operation, information display);
information logging and reporting;
data storage (short term/long term) ;
etc.
3.2.2 Requirements for operational parameters
The following operational parameters are specified within Publi-
cation 870-4:
reliability;
availability;
maintainability;
security;
_
data integrity;

time parameters;
accuracy.
In specifying the time parameters, particular consideration should be
given to the:
overall transfer time (sum of the times taken by the information
passing through the individual sections of telecontrol systems, but
also influenced by the network configuration, priority, accumu-
lation of events, etc. );
parameters for state information, such as separating capability,
.
time resolution, suppresslon time, etc. ;
updating time for measured values and set point commands;
etc
It should be emphasized that in specifying the above-mentioned
parameters the requirements of the process should be considered.
3
IS 12746 (Part l/Set 2) : 1993
IEC Pub 870-l-2 (1989)
3.2.3 Detailed specification
The facilities required snould be listed and briefly described
Below is a list of the standard facilities found in tel -ntrnr systems
3.2.3.1 /npf_Jt ano acquisition of monitored information
Single point information;
for alarms, state information, faulty state information, .cte
(fleeting information or persistent information);
double point informati,on with or without acquisition OT the inter
mediate state
for circuit-breakers, isolators, etc
integrated values
for telecounting of energy values, etc. ;
incremental information
for flow values, etc.;
measured values (analog or digital) with cyclic or periodic tr-arls
mission or transmission on demand
for telemetering of electric values, hydraulic values, etc.;
time tagging requirements;
group alarms or common alarms derived from digital or analog
information;
information related to the telecontrol system itself, e.g. trans-
mission error. alarms, equipment failure alarms, etc. ;
other types of information.
3.2.3,2 Output and presentation of information

State information;
double point information with or witholrt indicating the intermediate
state;
alarms, group alarms, common alarms;
pulse output or persistent indication of integrated values;
analog or digital display or measured value*;
information ,togging;
data storage functions.
3.2.3.3 Command input
Switching commands, single commands
to change the state of an operational equipment in one rlir~ct!(~r~
(pulse commands or persistent commands):
switching commands, double commands
for circuit- breakers, isolators, etc.
(pulse commands or maintained cotnmands) ;
4
IS 12746 (Part l/Set 2) : 1993 3
IEC Pub 870 -1-2 (1989)
set point commands
values which are transmitted to the controlled equipment;
adjusting commands
for changing the state of operational equipment having more than
two states;
regulating commands (analog or digital)
for closed loop telemonitoring and telecommand
(regulating step commands or persistent regula’ing commands);
select and execute commands;
instruction commands
for indicating a standard instruction to operators in the control
room of a manually operated remote station,
e.g. “Start generators”;
command sequences;
group commands
addressed to several items of equipment at an outstation;
broadcast commands
addressed to operational equipTent at several or all outstations of
a telecontrol system;
commands related to the telecontrol system itself;
interrogation commands;
check commands
e.g. for the purpose of ensuring that the telecontrol equipment is
functioning correctly;
other types of information.
3.2.3.4 Command output
Single commands;

double commands with or without supervision of faulty states;

set point commands with or without validity indication and with or
without storage;
adjusting commands;
command sequences;
indication of the instruction commands
3.3 Data quantities
The data quantities can be expressed by the number of input and
output points. The number of points cart be given in lists or tables.
drawn up to reflect functions requ i der as well as eht differe:!f
locations of telecontrot systems, for examples